Science Olympiad Dynamic Planet Practice Test

Which scale is specifically designed to assess the energy released by an earthquake?

1. Richter Scale

2. Moment Magnitude Scale

3. Modified Mercalli Scale

4. Intensity Scale

The correct answer is: Moment Magnitude Scale

The Moment Magnitude Scale is specifically designed to assess the energy released by an earthquake. This scale was developed to provide a more accurate measurement of an earthquake's size, especially for large events. Unlike the Richter Scale, which is based on the amplitude of seismic waves, the Moment Magnitude Scale takes into account the seismic moment of the earthquake. This moment is a product of the fault area that slipped during the earthquake, the average amount of slip on the fault, and the strength of the rocks involved. This method allows it to provide a more comprehensive assessment of the earthquake's total energy release. This scale is particularly effective for measuring large earthquakes because it remains accurate regardless of the location and depth of the seismic activity. It provides a logarithmic scale similar to the Richter Scale, but because it relies on more factors, it delivers a clearer picture of the earthquake's true magnitude and energy output. The Moment Magnitude Scale is now widely used by seismologists for estimating the size of earthquakes, especially in research and reporting. In contrast, while the Richter Scale is also a well-known measure of earthquake magnitude, it may not always accurately reflect the energy released in larger quakes. The Modified Mercalli Scale focuses on the intensity of shaking experienced at different locations